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(No Model.) 2 Sheets-Sheet 1. E. H. 'S'CRIBNEB. BOILER.

No. 483,369. Patented Sept. 27, 1892.

:15 I I l P 3 5 (No Model.) 2 Sheets-Sheet E. H. SGRIBNER.

BOILER. No. 483,369 Patented Sept. 27 1892., 1

mi! l wulluiiamim W cup-mummy Unrrnn STATES PATENT, OFFIcE.

EDWARD :H. sentence, or. THEUNITED srA'rEs NAVY.

BOILER.

SPECIFICATION forming part of Letters Batent No. 483,369, dated September 27, 1892.

Application filed June 29, 1,892. V

To all whom it may concern.-

Be it known that I, EDWARD H. SCRIBNER, assistant engineer in the United States Navy, serving on board the United States steamer Boston, at Mare Island, in the county of Solano and State of California, have invented certain new and useful Improvements in Boilers; and I do herebydeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in steam-boilers for use either on land or at sea; and it consistsof certain novel features hereinafter described and claimed.

Reference being had to the accompanying drawings, wherein the same parts are indicated by the same letters throughout the several views, Figure 1 representsa vertical central longitudinal section through the axis of the boiler and its connections. Fig. 2 represents a front View of the boiler,parts being broken away. Fig. 3 represents a rear view of the boiler with the end plate removed and parts being broken away.

The boiler proper consists of two semicylindrical portions A and B, connected together by a number of vertical water-tubes O, or the sides of the semicylinder may be prolonged somewhat to allow the water-tubes to be put in place. The feed-water enters through the mud-drum D at the base of the fire-box, passes up through a plurality of water-tubes E, preferably tangent to each other, and enters the drum D abreast of the water-tubes C. From this drum the feed-Water passes through the downcast pipes E-- one on either side of the boiler, as shown-- through the space F and front connection F down to the lower front end of the boiler. In its passage through the heated products of combustion the water has become considerably heated, and the danger of throwing cold water on the highly-heated crown-sheets is obviated. Equilibrium-pipes E are provided connecting the drum D to the upper portion of the boiler for the purpose of avoiding any conflicting current that might interfere with the free flow of water through the downcast pipes to the front of the boiler. Manholes a and b are provided in the upper and lower portions A and B, respectively, and braces a,

seen No. 488,458. memeaem connect the ends of the upper section of the boiler. The lower portion B of the boiler is sufficiently braced by the fire tubes F The products of combustion pass from the furnace F to the back connection F, through the fire-tubes F front connection F firespace F", uptake F and smoke-stack F, thus passing three times along the length of the boiler and heating the pipes E, drums D and D, and pipes E, as well as the portions of the boiler exposed to the products of combustion.

The front of the furnace K and sides K are preferably made of iron lined with brick K The rear plate of the boiler is made, preferably, of iron K lined with asbestus K. The first connection K is preferably of iron. For use at sea compactness is desired; but for land service these various parts, except the front connection, may be made of ordinary walls of fire-brick.

H represents the bridge-wall.

f'f f f f f represent doors for feeding the furnace and for removing ashes, cinders, soot, &c.,respectively.

The lower portion B of the boiler may be supported in any convenient way; butIhave shown it as resting at the front end of the furnace K and having along its sides a long flange or angle-iron 7c, riveted thereto and resting on the flange 7.". of the side pieces 76 of the furnace. The upper portion is sup ported by the vertical tubes only, so as to allow free expansion, and it can be stayed diagonally, if desired, to prevent injury from a ships rolling at sea.

These boilers may be joined together side by side or back to back and connected to one common smoke-stack, as when aboard ship, without materially modifying the arrangement herein shown.

It will be seen that the boiler herein described possesses the advantages of economy, having great heating-surface and high steaming capacity, compactness, and accessibility to the various parts for cleaning and repairs, as any tube maybe replaced without interferingwith any other, and any one of. the watertubes may be plugged.

The riveted joints are out of the fire with is such that no hydrokineters or other artificial means are necessary. Being adapted for cleaning salt, salt water may be used to a certain extent without injury. The weight of the individual shell-plates is reduced over those used in large equivalent cylindrical boilers, and the space occupied per square foot of heating surfaoe is small. For these and other reasons the boiler is especially adapted for use at sea.-

It will be evident that many modifications might be used without departing from the spirit of my invention.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. An apparatus for generating steam, comprising .a boiler composed of two sections joined together by vertical water-tubes and having firetubes in the-lower section and a fire-space around the said water-tubes, a mud drum'situated in the lower part of the fireboX,water-tubes leading from this drum-to a heating-drum in rear of-the boiler, and downcast or water pipesleading from said heatingdrum through the fire-space around said water-tubes to. the lower front portion of the lower section of the boiler, substantially as described.

2. An apparatus for generating steam, comprising a boiler composed of two sections joined together by Vertical Water-tubes and having fire-tubes in the lower section and a fire -space aroundthe said water-tubes, a muddrum situated in the lower part of the firetubes in the lower section of said boiler, and

a firespace around said Water-legs for the passage of the products of combustion, a front connection connecting said flues and said firespace, a mud drum situated inthelower portion of the fire-box, heating-pipes leading up-- ward from said mud-drum inside of the back connection, a heating-drum inside .of: the back connection, a heating-drum connected to said heating-pipes at the rear of the boiler, and downcast pipes leading from said drumto the lower sectionof the boiler, substantially as and for the purposes described.

In testimony whereof I affix my signature this the 17th day of June, 1892.

EDWARD H. SCRIBNER. Witnesses:

PERCY O. BOWEN, JOHN O. Wilson. 

